31results about How to "Shorten the transient" patented technology

The present invention is an electric vehicle power system that uses multiple permanent magnet motor/generators connected in series or parallel and multiple battery step switching. Motor, torque and speed are controlled by steps in series connection and then in parallel connection. Smooth acceleration, regeneration and current control are provided by delaying stepping from one battery step to the next until the next step is fully engaged. Transients are limited to the effect of one battery step by using rectifier shunt switching. Multiple motors provide acceleration torque at low speed in series connections and at cruising speeds in parallel connection. Regenerative deceleration is provided in the opposite manner. Battery depletion is averaged by flipping ends of a battery bank. Controls are provided with normal foot controls and a speed setter. A separate deceleration pedal or lever may be used.

An Optical Transport Network (OTN) transient management method, OTN node, and OTN network includes operating an OTN connection in a first mode in a network, the OTN connection traverses at least two nodes in the network, requesting a change in the OTN connection to a second mode which will cause a network transient, the change includes a timing change on the OTN connection affecting the at least two nodes, and performing transient management at the at least two nodes to mitigate the network transient, the transient management prevents spurious alarms due to the change between the first mode and the second mode.

Multilevel voltage arrangement having a transformer and a power converter or inverter comprising one or more common DC links connectable to a power source, said arrangement comprising one first set of H bridges being connected to said common DC link, wherein each of said H bridges comprises with at least two nodes connected to the ends of wirings at the primary side of a transfer, wherein control means are configured for controlling H bridges so as to achieve a multilevel voltage signal between the first node and the second node of said H bridges.

In a method of operating a gas turbine during shut down, the gas turbine is decelerated and closure of compressor inlet guide vanes (1) is initiated at a shaft speed at least 5% above the shaft speed where a vibration peak occurs. The compressor inlet guide vanes (1) are closed by an angle in the range from 15°-35°, preferably at a rate between 5° and 10° per second. The method effects a reduction of the risk of rotational stall.

A voltage regulation circuit intended to generate a regulated voltage for an electronic device, comprising: a transconductance amplifier based on a pair of MOS type differential amplifiers, said amplifier having a first input onto which a reference potential is applied and a second input onto which a counter reaction of said regulated voltage is input; a follower stage connected to the output from said transconductance amplifier; a MOS type transistor that will be used to make the output stage of the regulation circuit with a source connected to a first power supply potential. The transconductance amplifier comprises a resistive load 360 with a profile in K/gm, where gm is the transconductance coefficient of said input differential pair, said resistive load being connected to said first power supply potential.

A control system and method of predicting how a machine will respond to occasional or periodic service, and adjusting the machine accordingly to account for the change in machine behavior due to the service, mitigates transients in machine performance. A prediction of the service effect is fed forward to the existing control system just prior to the occurrence of service in order to compensate for the service effect. This prediction is continually updated and refined using subsequent measurements of the effect of service on machine performance. More specifically, a controller monitors the process output variables indicative of the machine performance and adjusts machine inputs to achieve a desired level of machine performance. The controller monitors the process output variables indicative of the machine performance prior to, during, and immediately after the service and adjusts the machine inputs to compensate for the transients.

This invention relates to a vacuum breaker of a solid-sealed outdoor high voltage phase controlled synchronous permanent magnet unit, in which, three insulation shells in the same internal structure are fixed on the upper end of the base, a permanent magnet is fixed at the bottom of the insulation shell, one end of the power output shaft of the magnet unit is connected with a high strength insulation pull rod, the other end of the rod is hinged on the moving touch rod of a vacuum quenching chamber fixed on a low line end by soft connection, the quenching chamber is fixed on the top of the shell, the static contactor of the quenching chamber is fixedly-connected with the upper inlet wire end cover electrically, a fixed frame is set at the bottom of the base, a control box is fixed on the frame with PLC, CPU single-chip processor, current and voltage phase detector and a controller electrically connected with the coil of the magnet unit.

The invention discloses a wind turbine generator set performance-guaranteeing maximum wind energy capturing method based on BLS and a double-layer SMC. The method includes solving a control target forrealizing maximum power tracking of the wind turbine generator; calculating a maximum power tracking error according to an effective wind speed estimation value given by a wind speed estimation modelbased on the BLS; designing the upper and lower bounds of the maximum power tracking error, converting the constrained maximum power tracking error into an unconstrained variable, solving the dynamiccharacteristics of the unconstrained variable, and designing a control signal expression and a control gain updating rate according to the double-layer SMC principle. The method is low in implementation cost, system overshoot and tracking errors can be reduced; meanwhile, the transient and steady-state performance of the system is guaranteed, the mechanical load of a unit transmission chain system can be reduced, the failure rate is reduced, the service life of the unit is prolonged, the implementation process is simple, the practicability is good, and compared with a traditional optimal torque control algorithm, the unit productivity can be improved, and the economic benefits of a wind power plant are increased.

An aircraft power supply for providing DC power with improved power quality characteristics to the aircraft. According to one embodiment, the aircraft power supply includes an input filter, a step-down transformer, one or more rectifier networks, and an output filter with a voltage modulation attenuator to passively improve power quality characteristics. The voltage modulation attenuator may use a certain arrangement of inductors, capacitors and diodes to reduce voltage transients in the aircraft power supply.

It is disclosed a technique in which Controlled Switching Devices (CSDs) are used to control medium and high voltage circuit breakers to mitigate switching transients. This invention describes a method for controlling the closing of a circuit breaker to mitigate and/or eliminate the inrush current in capacitive loads such as capacitor banks and filters by taking into account the residual DC voltage charges that may be present in the load. It is disclosed a method to perform fast switching operations on capacitive loads and therefore eliminate the load discharge period.

The invention discloses a medium-voltage phase selection closing switch, which comprises an intelligent phase selection controller and a medium-voltage phase selection closing switch. The intelligentphase selection controller and the medium-voltage phase selection closing switch are connected through a cable. The medium-voltage phase selection closing switch is formed by a frame, vacuum arc-extinguishing chambers, upper insulation structural members, insulation pull rods, lower insulation structural members and permanent magnet operating mechanisms. Each vacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller. Eachvacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller; and the medium-voltage phase selection closing switch is easy to operate, long in life and high in action reliability.

The arrangement (5) is designed as a gradual limiter and filter circuit to limit that input voltage at a connection pin (16) of an IC (1). The arrangment is electrically connected to the connection pin(16).